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What's the state of GP1[20] after power on?

SuitJune Young
Genius 3985 points

Accroding to the DataSheet,GP1[20]'s state is 

Its output is H.But In my board,it's LOW.

Anythiing wrong for my understanding?

Thanks for any reply.

BR.

  • 0
    TI__Guru**** 170625 points

    Hello,

    Are you on EZSDK? What is the value of your PINCTRL218 register (at address 0x48140B64) ?

    BR

    Pavel


  • 0 in reply to Pavel Botev
    Genius 3985 points

    I use RDK 3.0

    And it seems that I found the cause.

    When I turn the BootModePins to all ZERO,GP1[20] output HIGH after power on.But When I switch DM8168 to NandFlash Boot,GP1[20] outputs LOW.

    Right Now,just UBoot is in NandFlash.

    So I think that Uboot have chagned that output value.GP1[20] has the function of GPMC_DIR although I just use this pin for DM8168's AVS voltage adjusting.

    How to change Uboot's code to make GP1[20]'s output voltage unchanged after DM8168 power on?

    I am going to go to Uboot to find the cause.

  • 0 in reply to SuitJune Young
    TI__Guru**** 170625 points

    Hello,

    I have no view to RDK, but DM8168 device is communicating with NAND Flash through the GPMC interface. So I think you are in the right path, the u-boot source code is probably overwriting the PINCTRL218[2:0] MUXMODE = 0x1(GP1[20]) with 0x0 (GPMC_DIR), when switch to NandFlash Mode.

    Regards,

    Pavel